Electrochromic marking systems

Details Electrochromic marking systems Electrochromic marking systems

1984-07-31

1985-12-24

Hess, Bruce H.

Recorders

Record receiver deforming

204 2, 346217, 427151, B41M 520

Patent

active

045610010

ABSTRACT:
3-(N-R.sup.2 -N-Acylamino)-7-(N-R.sup.3 -N-R.sup.4 -amino)-10-acylphenothiazines and phenoxazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 3-(N-R.sup.2 -amino)-7-(N-R.sup.3 -N-R.sup.4 -amino)phenothiazinium or phenoxazinium halide with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with at least two molecular proportions of an acylating agent.

REFERENCES:
patent: 2909520 (1959-10-01), Buc
patent: 3873340 (1975-03-01), Miyazawa et al.
patent: 3900217 (1975-08-01), Hayashi et al.
patent: 4309255 (1982-01-01), Gendler et al.
Mariga & Oda "Color Reaction of Some Derivatives of Aminophthalide and Acylleucomethylene Blue Derivatives"-Kogyo Kagaku Zasshi 67 (7) 1050-4 (1964) (C.A. 62 2852b).
Smets & Simionescu "Polymer Induced Aggregation of Dye Molecules" Makromolecular Chemistry, 1977 198(9), 2719-23 (C.A. 87 186052t).

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